Its not all that complicated. All you need is about 4 hours , a toyotool 6mm valve tool and valve seal pliers (about $114 total from toyotool.com and worth every penny, use anything else and you run the risk of damaging your head), and about 15ft of soft braided nylon rope (about $5 @ home depot).
First get the cams off, then remove only the shim of the valve you are working on.(this way, you don't need to remember where each of the 24 go)
Next, turn the crank until the piston is at or near the bottom of the cylinder.
This is where the rope comes in.
Take the rope and get most of it inside the cylinder (at least 10ft)
Next, turn the crank until the rope is compressed in the cylinder.
This way the valve stems don't droop into the cylinder when removing/installing the seals.
Use the valve tool to pop the locking caps off of the valve springs (double bag them, they tend to get lost), next,
use the pliers to remove the seal from the stems (it may slip at first, after all, they are covered in oil). BE CAREFUL: Make sure when you pull on the seals, that you pull at the same angle that the stem is on, otherwise you'll have to re-smooth (with no less than 2000 grit paper) the cam journals, like I had to on one of mine.
Once you finish removing the old seal, pop the new one on, push it down with the front end of the pliers, install the locking cap and spring back on the stem's end, and pop the shim back in (that's it!:icon_bigg )
Use the valve tool on the next 3 valves the lather, rinse, repeat on all the other cylinders.
It may sound like a lot of work, but here's about how the time breaks down:
1st hour= taking off the Intake, cam gears, cover plate, and camshafts
2nd hour= learning how to use the valve tool, learning how to use the pliers with finesse AND strength, finishing the first valve.::w00t::
3rd hour= all 23 of the other valves:biglaugh:
4th hour= putting everything back in it's place
hope that helps!